u-boot/common/cmd_mmc_spi.c
Pantelis Antoniou 93bfd61677 mmc: Split mmc struct, rework mmc initialization (v2)
The way that struct mmc was implemented was a bit of a mess;
configuration and internal state all jumbled up in a single structure.

On top of that the way initialization is done with mmc_register leads
to a lot of duplicated code in drivers.

Typically the initialization got something like this in every driver.

	struct mmc *mmc = malloc(sizeof(struct mmc));
	memset(mmc, 0, sizeof(struct mmc);
	/* fill in fields of mmc struct */
	/* store private data pointer */
	mmc_register(mmc);

By using the new mmc_create call one just passes an mmc config struct
and an optional private data pointer like this:

	struct mmc = mmc_create(&cfg, priv);

All in tree drivers have been updated to the new form, and expect
mmc_register to go away before long.

Changes since v1:

* Use calloc instead of manually calling memset.
* Mark mmc_register as deprecated.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>
2014-03-24 12:58:56 +02:00

89 lines
2.1 KiB
C

/*
* Command for mmc_spi setup.
*
* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <mmc.h>
#include <spi.h>
#ifndef CONFIG_MMC_SPI_BUS
# define CONFIG_MMC_SPI_BUS 0
#endif
#ifndef CONFIG_MMC_SPI_CS
# define CONFIG_MMC_SPI_CS 1
#endif
/* in SPI mode, MMC speed limit is 20MHz, while SD speed limit is 25MHz */
#ifndef CONFIG_MMC_SPI_SPEED
# define CONFIG_MMC_SPI_SPEED 25000000
#endif
/* MMC and SD specs only seem to care that sampling is on the
* rising edge ... meaning SPI modes 0 or 3. So either SPI mode
* should be legit. We'll use mode 0 since the steady state is 0,
* which is appropriate for hotplugging, unless the platform data
* specify mode 3 (if hardware is not compatible to mode 0).
*/
#ifndef CONFIG_MMC_SPI_MODE
# define CONFIG_MMC_SPI_MODE SPI_MODE_0
#endif
static int do_mmc_spi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
uint bus = CONFIG_MMC_SPI_BUS;
uint cs = CONFIG_MMC_SPI_CS;
uint speed = CONFIG_MMC_SPI_SPEED;
uint mode = CONFIG_MMC_SPI_MODE;
char *endp;
struct mmc *mmc;
if (argc < 2)
goto usage;
cs = simple_strtoul(argv[1], &endp, 0);
if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
goto usage;
if (*endp == ':') {
if (endp[1] == 0)
goto usage;
bus = cs;
cs = simple_strtoul(endp + 1, &endp, 0);
if (*endp != 0)
goto usage;
}
if (argc >= 3) {
speed = simple_strtoul(argv[2], &endp, 0);
if (*argv[2] == 0 || *endp != 0)
goto usage;
}
if (argc >= 4) {
mode = simple_strtoul(argv[3], &endp, 16);
if (*argv[3] == 0 || *endp != 0)
goto usage;
}
if (!spi_cs_is_valid(bus, cs)) {
printf("Invalid SPI bus %u cs %u\n", bus, cs);
return 1;
}
mmc = mmc_spi_init(bus, cs, speed, mode);
if (!mmc) {
printf("Failed to create MMC Device\n");
return 1;
}
printf("%s: %d at %u:%u hz %u mode %u\n", mmc->cfg->name, mmc->block_dev.dev,
bus, cs, speed, mode);
mmc_init(mmc);
return 0;
usage:
return CMD_RET_USAGE;
}
U_BOOT_CMD(
mmc_spi, 4, 0, do_mmc_spi,
"mmc_spi setup",
"[bus:]cs [hz] [mode] - setup mmc_spi device"
);